17179860 divided by 645 
We're looking to find how many times 645 goes into 17179860.

Step 1:
If we divide 1 by 645, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 645

Going ahead to step 2:
645 goes into 17 0 times with a remainder of 17.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 17 leaves us with 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 645

On to step 3:
645 goes into 171 0 times with a remainder of 171.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 171, we end up with 171.
Append the next digit (7) from the dividend to 171 and continue with: 1717 / 645

Let's proceed to step 4:
1717 divided by 645 is 2 with a remainder of 427.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 1290 from 1717 leaves us with 427.
Grab the next digit (9) from the dividend, add it to 427, then carry on: 4279 / 645

Going ahead to step 5:
If we divide 4279 by 645, we get 6 and a remainder of 409.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
Subtract 3870 from 4279 to get 409.
Include the next digit (8) from the dividend after 409, then repeat: 4098 / 645

Advancing to step 6:
The number 645 fits into 4098 6 times, leaving a remainder of 228.
Put 6 as the next digit of the answer. 
Result so far: 266.0
If we subtract 3870 from 4098, we get 228.
Include the next digit (6) from the dividend after 228, then repeat: 2286 / 645

On to step 7:
2286 divided by 645 is 3 with a remainder of 351.
Use 3 as the next digit of our solution. 
Result so far: 2663.0
Subtracting 1935 from 2286 leaves us with 351.
Grab the next digit (0) from the dividend, add it to 351, then carry on: 3510 / 645

On to step 8:
645 can be fit into 3510 5 times, resulting in a remainder of 285.
Put 5 as the next digit of the answer. 
Result so far: 26635.0
If we subtract 3225 from 3510, we get 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Advancing to step 9:
2850 divided by 645 is 4 with a remainder of 270.
The number 4 becomes the next digit in our result. 
Result so far: 26635.4
The remainder is 270 after subtracting 2580 from 2850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 10:
645 can be fit into 2700 4 times, resulting in a remainder of 120.
Use 4 as the next digit of our solution. 
Result so far: 26635.44
Subtract 2580 from 2700 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

After the division, we end up with 26635.44 and a remainder of 0.12.